GPT-5.5 Pro vs Claude Sonnet 4
Claude Sonnet 4 is cheaper on output tokens, while GPT-5.5 Pro offers a larger context window. Choose GPT-5.5 Pro or Claude Sonnet 4 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.5 Pro | Claude Sonnet 4 |
|---|---|---|
| Provider | FastRouter | FastRouter |
| Input / 1M tokens | $30.00 | $3.00 |
| Output / 1M tokens | $180.00 | $15.00 |
| Context window | 1.1M | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Apr 2026 | May 2025 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.